Here is a whimsical version of the 12 pentomino shapes that make up the Quintillions set. Each piece resembles an animal, done in nice woods with natural finish. This handcrafted work of art is by Dan Klarskov, a puzzle lover and woodworker from Denmark. Notice the bar at far right that can be placed in any notch to block off any size rectangle step by step, from 3x5 to 12x5. See more of Dan's puzzles on his website.